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Hopefully they left you enough pipe on the other side of the valve so you can cut it off. It would be a bummer if you had to rebuild the whole manifold just to change a valve.
They do make a tool that will drill out the pvc pipe. It's not cheap but does work. I paid about 40 dollars for mine. I've only needed it three or four times in the 10 years I've owned it. But it saved about 6 hours work since I didn't have to rebuild the manifold.
Another time I was able to clean out a fitting two feet under a cement patio and reglue it.

One thing Todd forgot to mention: allow plenty of time.
You might consider getting a valve that has threaded connections for your replacement. In THEORY it will make any future replacement easier. In theory.